Labor Simulator - Downloadable Details  Brings childbirth theory to life by using sound to represent contractions. The 7-track set of MP3 files can be imported to your iPod or other MP3 device, and then used as the soundtrack to a practice labor exercise, lasting 1 hour, or 1 hour 20 minutes, or 2 hours. Price: $30.00 Labor Simulator 2 hour DVD Details  Brings childbirth theory to life by using sound to represent contractions. The audio-only DVD can be used as the soundtrack to a practice labor exercise, lasting 1 hour, or 1 hour 20 minutes, or 2 hours. Price: $35.00